Some would replace with seperates, some coax, and others still would remove the oem speakers and replace with nothing (audio is recorded in stereo, so there is no real reason to have more than two channels).

Personally, I would replace with coax, as I like a bit of rear fill, but don't think that seperates are cost effective as rear speakers (as you can't really here the difference from the driver's seat to the rear deck).

Nice choice on brand by the way, Infinity makes great stuff for the money!!

I differ slightly. I am of the 2 channels and forget the back camp. If you must have something back there get another set on components but do not hook ut the tweeters. This willl give you rear fill without messing up your front soundstage.

Even better, put your references in the back and get some Kappas for the front. Then you will be amazed.